/Engine/Source/Editor/VREditor/Public/UI/VREditorUISystem.h
Adds a hoverable button of a given type to an overlay, using menu data from a BlockWidget
[TSharedRef](API\Runtime\Core\Templates\TSharedRef)< [SWidget](API\Runtime\SlateCore\Widgets\SWidget) > AddHoverableButton ( [TSharedRef](API\Runtime\Core\Templates\TSharedRef)< [SWidget](API\Runtime\SlateCore\Widgets\SWidget) > & BlockWidget, [FName](API\Runtime\Core\UObject\FName) ButtonType, [TSharedRef](API\Runtime\Core\Templates\TSharedRef)< [SOverlay](API\Runtime\SlateCore\Widgets\SOverlay) > & TestOverlay )